00450nam a22001097a 4500003000400000082002900004100001800033245021400051260005500265300000800320546001200328OSt  aINDIA/AGRI&IRR/1:22/1980  aAhnfors, Mats  aStudies on optimisation of ground water extraction structures and revitalisation of dug wells: SIDA Assisted ground water project in Noyil, Ponnani and Amaravati River basins, Tamil Nadu and Kerala Report 1:22  aCoimbatorebMinistry of ahriculture and irrigation  a8p.  aEnglish